I cannot find Themo wifi when in setup mode.

Themo has to be in configuration mode to have the wifi available. In configuration mode, Themo LED circle is red and the colours are going around the circle.

You can enter into Themo configuration mode:

Turn Themo into OFF mode by clicking front panel until lights are turned off

When in OFF mode, hold down the button for 10 seconds until the lights will turn RED

If Themo is in configuration mode and you cannot find Themo wifi, make sure you are using a device that is capable of detecting wifi networks (e.g. smartphone or a laptop). Then turn your Wifi off and on again.